US10415527B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
US10415527B2
US10415527B2 US15/547,198 US201615547198A US10415527B2 US 10415527 B2 US10415527 B2 US 10415527B2 US 201615547198 A US201615547198 A US 201615547198A US 10415527 B2 US10415527 B2 US 10415527B2
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Prior art keywords
valve
seat portion
valve body
fuel injection
diameter
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US20180010564A1 (en
Inventor
Takao Miyake
Atsushi Nakai
Kiyotaka Ogura
Akira Iizuka
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Assigned to HITACHI AUTOMOTIVE SYSTEMS, LTD. reassignment HITACHI AUTOMOTIVE SYSTEMS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IIZUKA, AKIRA, NAKAI, ATSUSHI, MIYAKE, TAKAO, OGURA, KIYOTAKA
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Assigned to HITACHI ASTEMO, LTD. reassignment HITACHI ASTEMO, LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI AUTOMOTIVE SYSTEMS, LTD.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F16K1/427—Attachment of the seat to the housing by one or more additional fixing elements

Definitions

  • the present invention relates to a fuel injection valve used for an internal combustion engine.
  • a fuel injection valve is disclosed in PTL 1, in which a valve body including a ball valve opening and closing an injection hole in an injection valve body is slidably incorporated, and between the injection valve body and the valve body, there are provided upper and lower valve guide portions including guide surfaces of the injection valve body, and sliding surfaces of the valve body sliding on the guide surfaces, a stopper of the injection valve body, and a flange of the valve body having an abutment surface formed to make abutment contact with the stopper upon opening the valve body, and in the fuel injection valve, the sliding surfaces on the upper and lower sides of the valve body are formed to have a substantially spherical shape, and clearances between the guide surfaces and the sliding surfaces in the upper and lower valve guide portions are set in a precise fitting condition without rattling.
  • a sliding surface of a guide ring makes contact with a guide surface of the core, in which the sliding surface has a spherical shape, the guide ring constitutes the valve body, and the guide surface has a smooth shape. That is, the sliding surface of the guide ring has the spherical shape not distorted, and even if the valve body is inclined relative to the guide surface of the core, the guide ring constituting the valve body is slidably held in an axial direction.
  • the ball valve as a component member of the valve body has little change in velocity opening and closing a fuel injection hole, and a fuel injection rate can be prevented from being changed with time.
  • a fuel injection valve is disclosed in PTL 2.
  • the fuel injection valve is a fuel injector 1 made up of a nozzle body 2 , and in the nozzle body 1 , a valve needle 3 is positioned.
  • This valve needle 3 is in operative connection with a valve-closing chain body 4 , and this valve-closing chain body 4 cooperates with a valve-seat surface 6 disposed on a valve-seat member 5 to form a sealing seat.
  • the fuel injection valve 1 according to an example illustrated in the figure includes at least one injection opening 7 , and can be released inward.
  • the valve-closure member 4 of fuel injector 1 designed according to the present invention which has a nearly spherical form is disclosed.
  • valve body has an end portion having a spherical shape, and formed with a guide portion and a seat portion with an injection hole cup, but a magnitude relationship between curvature radii and positions of centers of curvatures of the guide portion and a valve seat portion are not described.
  • Recent exhaust gas regulation requires reduction of an amount and quantity of particulate matter included in an exhaust gas, and a normal maximum fuel pressure may be increased to approximately 35 MP.
  • a normal maximum fuel pressure is 35 MPa
  • the fuel injection valve is required to be operated for example at a pressure up to 45 MPa. In such a condition, a fluid force may exceed a valve opening force depending on a seat diameter, and the needle valve cannot be kept open and closed, when opening thereof is required.
  • a fuel injection valve includes a valve seat portion, a valve body which is seated on or separated from the valve seat portion, an injection hole which is formed on a downstream side from the valve seat portion, and a guide portion which is formed on an upstream side from the valve seat portion seating a valve body seat portion of the valve body to guide a guided portion on a downstream side of the valve body, in which the valve seat portion is formed to have a dimension in a crossing direction crossing an axial direction of 0.4 to 0.8 times a dimension of the guide portion in the crossing direction.
  • a fuel injection valve can be provided which is configured so that even if a fuel injection valve is required to be operated for example at a pressure up to 45 MPa, under a normal maximum fuel pressure of 35 MPa, a fluid force is not larger than a valve opening force, and a needle valve can be kept open when required.
  • FIG. 1 is an overall cross sectional view of a fuel injection valve according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of an end portion of a fuel injection valve according to an embodiment of the present invention.
  • FIG. 3 is an enlarged cross-sectional view of an end portion of a fuel injection valve according to an embodiment of the present invention.
  • FIG. 4 is an enlarged cross-sectional view of an end portion of a fuel injection valve according to an embodiment of the present invention.
  • FIG. 5 is a graph illustrating a relationship between a seat diameter of a valve body and a fluid force.
  • FIG. 6 is a transverse cross-sectional view of an end portion of a fuel injection valve according to an embodiment of the present invention.
  • An internal combustion engine includes a fuel injection controller which performs calculation for appropriately converting an amount of fuel according to an operational state to an injection time of a fuel injection valve, and drives the fuel injection valve supplying fuel.
  • the fuel injection valve is, for example, configured so that a armature includes a cylindrical armature, and a needle valve positioned at the center of the armature, a gap is provided between an end surface of a stator having a fuel introduction hole guiding fuel to a center portion, and an end surface of the armature, and an electromagnetic solenoid supplying a magnetic flux is provided in a magnetic passage including the gap.
  • the magnetic flux passing through the gap generates a magnetic attraction force between the end surface of the armature and the end surface of the stator, and the magnetic attraction force attracts the armature toward the stator to drive the armature, and separates a valve body of the needle valve from a valve seat to open a fuel passage provided in the valve seat.
  • An amount of fuel injected is mainly determined by a differential pressure between a fuel pressure and an peripheral pressure at an injection hole portion of the fuel injection valve, and a time period in which fuel is injected while the valve body is kept open.
  • valve body and the armature When energization of the electromagnetic solenoid is terminated, magnetic attraction force acting on the armature disappears, the valve body and the armature are moved in a closing direction by a force of a resilient member urging the valve body in the closing direction, and a drop in pressure caused by a flow velocity of fuel flowing between the valve body and the valve seat, and the valve body is seated on the valve seat to close the fuel passage.
  • the valve body and the valve seat are brought into abutment contact to seal fuel, and fuel is prevented from leaking from the fuel injection valve at unintended timing.
  • a fuel injection valve is required to have a profile accuracy of abutment portions of a valve body and a valve seat of, for example, not more than 1 ⁇ m, for reduction in amount of fuel leaked from an end of the fuel injection valve.
  • a gap between the valve body and a guide member provided upstream from the valve seat to guide the valve body is, for example, only several micrometers.
  • a diameter of the seat portion is effectively reduced to reduce the fluid force.
  • reduction of the seat diameter means reduction of a curvature of the ball at the end including the guide portion.
  • an inner diameter of the guide portion of an injection hole cup guiding the valve body needs to be reduced with difficulty in machining and manufacture.
  • an inner diameter of the guide portion of the injection hole cup needs to be increased, and when the injection hole cup has a restricted maximum dimensions, the inner diameter cannot be freely increased.
  • a fuel injection valve according to the present example have different curvature radii between a guide portion and a seat portion of a valve body, and centers of curvatures of the guide portion and the seat portion of the valve body are coincide with each other to freely design a diameter of the seat portion without depending on a diameter of the guide portion.
  • the curvature radius of the seat portion can be reduced independently of the guide portion of the valve body, and a force generated by a difference in pressure of fluid at the seat portion can be reduced to keep the valve body open by a fuel pressure higher than a fuel pressure of a conventional fuel injection valve.
  • FIG. 1 is a longitudinal cross-sectional view of a fuel injection valve according to an embodiment of the present invention.
  • FIGS. 1 to 5 are longitudinal cross-sectional views of a fuel injection valve according to an embodiment of the present invention.
  • FIGS. 2 to 5 are partial enlarged views mainly illustrating an injection hole cup 116 and a valve body end portion 114 B of FIG. 1 , in which limited characteristic components of the fuel injection valve according to the present example are illustrated, and shapes thereof are simplified.
  • FIGS. 2 to 5 the sizes of components or sizes of gaps are exaggerated for easy understanding of operation or function, and unnecessary components are omitted for description of the function.
  • the same elements are denoted by the same reference signs, and repeated description will be omitted.
  • an injection hole cup-supporting body 101 includes a small-diameter cylindrical portion 22 having a small diameter, and a large-diameter cylindrical portion 23 having a large diameter.
  • the injection hole cup (fuel injection hole-forming member) 116 including a guide portion 115 and a fuel injection hole 117 is inserted or press-fitted into an end portion of the small-diameter cylindrical portion 22 , and an outer peripheral edge of an end surface of the injection hole cup 116 is circumferentially welded to be fixed to the small-diameter cylindrical portion 22 .
  • a needle valve 114 A provided at an end of a needle valve 114 A constituting a armature, described later, is moved vertically in an axial direction of the fuel injection valve, the guide portion 115 functions to guide an outer periphery of the needle valve 114 A.
  • a valve seat portion 39 of conical shape is formed on the downstream side from the guide portion 115 .
  • the needle valve 114 A provided at the end of the needle valve 114 A is brought into abutment contact with or separated from the valve seat portion 39 , and fuel flow is blocked or guided to the fuel injection hole.
  • a groove is formed in an outer periphery of the injection hole cup-supporting body 101 , and a combustion gas sealing member as represented by a tip seal 131 made of resin is fitted into the groove.
  • a needle valve guide member 113 guiding the needle valve 114 A constituting the armature is fixedly fitted into a drawn portion 25 of the large-diameter cylindrical portion 23 .
  • a guide portion 127 guiding the needle valve 114 A in the axial direction thereof is provided at the center of the needle valve guide member 113 , and a plurality of fuel passages 126 are formed around the guide portion 127 .
  • a position of the needle valve 114 A having an elongated shape is radially defined by the guide portion 127 of the needle valve guide member 113 , and the needle valve 114 A is guided to reciprocate linearly in the axial direction.
  • a valve opening direction is a direction oriented upward in a valve axial direction
  • a valve closing direction is a direction oriented downward in the valve axial direction.
  • An end portion of the needle valve 114 A opposite to the end portion provided with the valve body end portion 114 B, is provided with a head portion 114 C having a stepped portion 129 having an outer diameter larger than a diameter of the needle valve 114 A.
  • An upper end surface of the stepped portion 129 is provided with a seat surface fora spring 110 urging the needle valve 114 A in the valve closing direction, and the seat surface and the head portion 114 C hold the spring 110 .
  • the armature has a armature 102 including a through-hole 128 for passage of the needle valve 114 A at the center.
  • a zero spring 112 urging the armature 102 in the valve opening direction is held between the armature 102 and the needle valve guide member 113
  • a diameter of the through-hole 128 is smaller than a diameter of the stepped portion 129 of the head portion 114 C, and under action of an urging force of the spring 110 pressing the needle valve 114 A to the valve seat of the injection hole cup 116 or gravity, an upper side surface of the armature 102 held by the zero spring 112 and a lower end surface of the stepped portion 129 of the needle valve 114 A are brought into abutment contact, and the armature 102 and the stepped portion 129 are engaged with each other.
  • the armature 102 and the stepped portion 129 are cooperatively operated corresponding to upward movement of the armature 102 against an urging force of the zero spring 112 or the gravity or downward movement of the needle valve 114 A along the urging force of the zero spring 112 or the gravity.
  • a force moving the needle valve 114 A upward and a force moving the armature 102 downward are independently act on the armature 102 and the stepped portion 129 , regardless of the urging force of the zero spring 112 or the gravity, the armature 102 and the stepped portion 129 can be moved in different directions.
  • a fixed core 107 is press-fitted into an inner peripheral portion of the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 , and welded and joined at a press-fit contact position. This welding and joining seals a gap formed between an inside of the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 and ambient air.
  • a through-hole 107 D having a diameter slightly larger than the diameter of the stepped portion 129 of the needle valve 114 A is provided as a fuel instruction passage.
  • a lower end surface of the fixed core 107 , an upper end surface and a collision end surface of the armature 102 may be plated to improve durability.
  • the armature includes a soft magnetic stainless steel having a relative softness, hard chromium plating or electroless nickel plating can be employed for securing reliable durability.
  • a lower end of the spring 110 for setting an initial load is in abutment contact with a spring-receiving surface formed on the upper end surface of the stepped portion 129 provided at the head portion 114 C of the needle valve 114 A, the other end of the spring 110 is received by an adjuster 54 press-fitted into the through-hole 107 D of the fixed core 107 , and the spring 110 is held between the head portion 114 C and the adjuster 54 . Adjustment of the fixed position of the adjuster 54 enables adjustment of the initial load of the spring 110 pressing the needle valve 114 A against the valve seat portion 39 .
  • a housing 103 having a cup shape is fixed to an outer periphery of the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 .
  • a through-hole is provided at the center of a bottom portion of the housing 103 , and the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 is inserted through the through-hole.
  • the housing 103 has an outer periphery wall, and an outer periphery yoke portion is formed on the outer periphery wall to face an outer peripheral surface of the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 .
  • An electromagnetic coil 105 formed into an annular shape is disposed in a cylindrical space formed by the housing 103 .
  • the coil 105 includes an annular coil bobbin 104 having a groove of U-shaped cross-section opening radially outward, and a copper wire wound in the groove.
  • a conductor 109 having rigidity is fixed at a winding start end and a winding finish end of the coil 105 , and is drawn out from a through-hole provided in the fixed core 107 .
  • Outer peripheries of the conductor 109 , the fixed core 107 , and the large-diameter cylindrical portion 23 of the injection hole cup-supporting body 101 are molded in an insulating resin injected from an inner periphery of an upper end opening portion of the housing 103 , and coated with a molded resin 121 .
  • a magnetic passage having a toroidal shape is formed around the electromagnetic coil ( 104 , 105 ).
  • a plug supplying power from a high-voltage power supply or a battery power supply is connected to a connector 43 A formed at an end of the conductor 109 , and controlled between energization and non-energization by a controller not illustrated.
  • a magnetic flux passing through an magnetic circuit 140 generates a magnetic attraction force between the armature 102 of the armature 114 and the fixed core 107 in a magnetic attraction gap, and the armature 102 is attracted with a force exceeding a set load of the spring 110 and moved upward.
  • the armature 102 engages with the head portion 114 C of the needle valve, and moves upward with the needle valve 114 A, until the upper end surface of the armature 102 collides with the lower end surface of the fixed core 107 . Therefore, the valve body end portion 114 B at the end of the needle valve 114 A separates from the valve seat portion 39 , and fuel passes through the fuel passage 118 , and is ejected from the injection hole 117 at an end of the injection hole cup 116 into a combustion chamber of an internal combustion engine.
  • valve body end portion 114 B at the end of the needle valve 114 A is separated from the valve seat portion 39 , and pulled upward, the needle valve 114 A having the elongated shape is guided at two positions of the guide portion 127 of the needle valve guide member 113 , and the guide portion 115 of the injection hole cup 116 to reciprocate linearly along the valve axial direction.
  • the needle valve 114 A having the elongated shape is guided only by the guide portion 127 of the needle valve guide member 113 , and is not in contact with the guide portion 115 of the injection hole cup 116 .
  • the stepped portion 129 of the head portion 114 C makes abutment contact with an upper surface of the armature 102 to move the armature 102 toward the needle valve guide member 113 against the force of the zero spring 112 .
  • the valve body end portion 114 B collides with the valve seat portion 39 , the armature 102 separated from the needle valve 114 A keeps moving toward the needle valve guide member 113 by an inertial force.
  • friction is generated by fluid, between the outer periphery of the needle valve 114 A and an inner periphery of the armature 102 , and energy of the needle valve 114 A, which rebounds from the valve seat portion 39 again in the valve opening direction, is absorbed.
  • FIG. 2 is an enlarged cross-sectional view of an end of the fuel injection valve when the needle valve 114 A is in a closed state.
  • a slight gap is provided between a guided portion 201 of the valve body end portion 114 B and a guide portion 202 of the injection hole cup 116 , and when the armature illustrated in FIG. 3 is in an opened state, a position of the valve body end portion 114 B is radially defined.
  • the guided portion 201 of the valve body end portion 114 B has a shape which is part of a spherical surface having a diameter ⁇ D.
  • the valve body seat portion 203 of the valve body end portion 114 B making abutment contact with the valve seat portion 39 of the injection hole cup 116 has a shape which is part of a spherical surface having a diameter ⁇ S.
  • FIG. 3 is an enlarged cross-sectional view of an end of the fuel injection valve when the needle valve 114 A is in an opened state.
  • An upstream portion 401 of the injection hole cup 116 is filled with fuel under high pressure (e.g., 20 MPa).
  • a gap 402 is provided between the valve seat portion 39 of the injection hole cup 116 and the valve body seat portion 203 of the valve body end portion 114 B.
  • An external portion 403 from the injection hole cup 116 is under the pressure of a cylinder of the internal combustion engine, for example, approximately 0.1 MPa.
  • a difference in pressure between the upstream portion 401 and the external portion 403 increases a flow velocity of fuel in the fuel injection valve, from a gap 402 to the injection hole 117 , and the fuel flows out to the external portion 403 . That is, in comparison with the upstream portion 401 , in an area downstream from a seat diameter ⁇ A of the valve body end portion 114 B, fuel pressure is considerably reduced, and a force (hereinafter, referred to as fluid force) obtained by multiplying an area of the seat diameter ⁇ A by a fuel pressure difference between the upstream portion 401 and the area downstream from the seat diameter ⁇ A is applied to the needle valve 114 A in a downstream direction of FIG. 3 .
  • FIG. 6 is a transverse cross-sectional view of an end portion of the fuel injection valve Fuel flowing near the valve body end portion 114 B flows in an outer peripheral side flow passage 500 , toward the downstream side of the valve body end portion 114 B.
  • the outer peripheral side flow passage 500 is located at a position corresponding to the guided portion 201 of the valve body end portion 114 B in the axial direction, and is formed to be recessed to an inner peripheral side. Furthermore, the outer peripheral side flow passage 500 is formed between adjacent guided portions 201 .
  • FIG. 5 is a graph illustrating the fluid force generated while the valve body is opened, with respect to the diameter ⁇ A of the valve body seat portion 203 of the needle valve 114 A.
  • a normal maximum fuel pressure is 20 MPa
  • the fuel injection valve is required to be operated for example at a pressure up to 30 MPa.
  • the seat diameter is ⁇ A 2
  • the fluid force is Fc 1
  • the fluid force is smaller than a force Fo (hereinafter, referred to as valve opening force) obtained by subtracting the set load of the spring 110 from a force of the fixed core 107 attracting the armature 102 (hereinafter, referred to as magnetic attraction force), upon energization of the coil 105 of the fuel injection valve of FIG. 1 , and the needle valve 114 A can be kept open.
  • a force Fo hereinafter, referred to as valve opening force
  • the recent exhaust gas regulation requires reduction of the amount and quantity of particulate matter included in the exhaust gas, and the normal maximum fuel pressure may be increased to approximately 35 MP.
  • the fuel injection valve is required to be operated for example at a pressure up to 45 MPa.
  • the seat diameter is ⁇ A 2
  • the fluid force is Fc 2
  • the fluid force is larger than the valve opening force Fo, and the needle valve 114 A can not be kept open and closed.
  • the fuel injection valve includes the valve seat portion 39 , a valve body 114 which is seated on or separated from the valve seat portion 39 , the injection hole 117 which is formed on a downstream side from the valve seat portion 39 , and the guide portion 202 which is formed on an upstream side from the valve seat portion 39 seating the valve body seat portion 203 of the valve body 114 to guide the guided portion 201 on a downstream side of the guide valve body 114 .
  • the valve seat portion 39 is formed to have a dimension in a crossing direction crossing the axial direction of 0.4 to 0.8 times a dimension of the guide portion 202 in the crossing direction.
  • the present inventors have found that when the dimension of the guide portion 202 in the crossing direction crossing the axial direction, that is, a diameter ⁇ G is set to 2 mm, and the dimension of the valve seat portion 39 in the crossing direction, that is, the diameter ⁇ A is set to 1.6 mm or less, and the needle valve 114 A can be kept open, even if the maximum fuel pressure is approximately 35 MP.
  • the diameter ⁇ A is set to 0.8 mm or less
  • the seat diameter ⁇ A is too small, a contact area between the valve body seat portion 203 and the valve seat portion 39 is reduced, and the contact pressure is increased.
  • the contact pressure is large, a material having a high strength is required for the valve body seat portion 203 and the valve seat portion 39 , and thus, this is not preferable from the viewpoint of inexpensive production of the fuel injection valve.
  • valve body seat portion 203 is formed to have a dimension (diameter) in the crossing direction crossing the axial direction of 0.4 to 0.8 times the dimension (diameter) of the guided portion 201 of the valve body 114 in the crossing direction.
  • the valve body seat portion 203 and the valve seat portion 39 preferably make a line contact, but microscopically make a surface contact.
  • measurement of the seat diameter ⁇ A of the valve body seat portion 203 or the valve seat portion 39 is performed using a center portion of the surface contact, and thus, functions and effects according to the present example can be obtained.
  • the same is applied to the dimension (diameter ⁇ G) of the guide portion 202 or the guided portion 201 , and when a contact surface does not have linear contact, measurement is preferably performed using a center portion of the contact.
  • the present invention is effective not only for keeping the valve body open under high fuel pressure, but also for increasing the injection rate.
  • valve body seat portion 203 is formed to have a curvature radius of 0.7 to 1.5 times the curvature radius of the guided portion 201 , corresponding to the above configuration, the seat diameter ⁇ A can be reduced or increased, independently of the guided portion 201 , as in the above, and similar effects can be obtained.
  • FIG. 4 is a schematic diagram illustrating a state in which the needle valve 114 A of the fuel injection valve according to the present invention is slightly inclined in the fuel injection valve.
  • the position of the needle valve 114 A is restricted in a direction opposite to the injection hole cup 116 , in the fuel injection valve, and radially restricted also, for example, in the guide portion 127 in FIG. 1 .
  • Components used for a fuel injection valve industrially have slight variation, and a valve body is slightly inclined in terms of accuracy in dimension and accuracy in assembly.
  • inclination between these two components is defined as ⁇ . Note that, for convenience of understanding, ⁇ in FIG. 3 is illustrated larger than actual inclination.
  • the valve body end portion 114 B of the fuel injection valve according to the present invention is characterized in that the spherical surface diameter ⁇ D of the guided portion 201 and the spherical surface diameter ⁇ S of the valve body seat portion 203 have the same center portion 303 . From this characteristic, the guided portion 201 and the valve body seat portion 203 have different spherical surface diameters, but are rotated around the same center portion 303 relative to the inclination ⁇ of the needle valve 114 A.
  • any of the valve body seat portion 203 and the guided portion 201 of the valve body 114 making abutment contact with the valve seat portion 39 has a spherical shape, and the curvature radius of the valve body seat portion 203 and the curvature radius of the guided portion 201 are formed to be different from each other.
  • the centers of the curvature radii of the guided portion 201 and the valve body seat portion 203 are coincide with each other.
  • the injection hole 117 is formed in the injection hole cup 116 provided at a downstream end, and the guide portion 202 guiding the guided portion 201 on the downstream side of the valve body 114 is formed in the injection hole cup 116 .
  • the valve body seat portion 203 makes abutment contact with the valve seat portion 39 of the injection hole cup 116 , on the spherical surface having a diameter ⁇ S, and seat performance is not influenced. Furthermore, the spherical surface having the diameter ⁇ D forming the guided portion 201 is also rotated around the center portion 303 the same as that of the spherical surface having a diameter ⁇ S of the valve body seat portion 203 , and a distance between the guided portion 201 of the valve body and the guide portion 202 of the injection hole cup is not changed.
  • the shapes of the guided portion 201 and the valve body seat portion 203 of the valve body end portion 114 B are formed by external machining, and the spherical surface diameters thereof can be partially changed with minimal increase in processing cost. Therefore, provided is a fuel injection valve which is configured so that the seat diameter ⁇ A of the valve body seat portion 203 of the valve body end portion can be reduced to keep the valve body open under high fuel pressure, without changing the inner diameter ⁇ G of the guide portion 202 of the injection hole cup 116 , in order to respond to high fuel pressure.
  • the curvature radius of the valve body seat portion 203 is preferably not more than the curvature radius of the guided portion 201 . This is because the curvature radius of the seat portion 203 of the valve body can be reduced to reduce a force generated due to a difference in pressure of fluid, generated at the seat portion, and even if the valve body is opened and held under a fuel pressure higher than that of a conventional one, an inner diameter of the guided portion 201 does not need to be reduced, and processability and manufacturing cost are similar to those of a conventional one, as described above with reference to FIG. 5 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US15/547,198 2015-01-30 2016-01-12 Fuel injection valve Active 2036-01-20 US10415527B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2015016302 2015-01-30
JP2015-016302 2015-01-30
PCT/JP2016/050607 WO2016121475A1 (ja) 2015-01-30 2016-01-12 燃料噴射弁

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US10415527B2 true US10415527B2 (en) 2019-09-17

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US (1) US10415527B2 (zh)
EP (1) EP3252302B1 (zh)
JP (1) JP6355765B2 (zh)
CN (1) CN107208593B (zh)
WO (1) WO2016121475A1 (zh)

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